At what age???

I'm just curious at what age is it ok for you to give your baby adult food? Like bananas, strawberries, and cookies? My friends baby just barley turned 6 month's old and has been eating this stuff for a while. I didn't think they could or should have that stuff at that age? Especially cookies??

*God, once again! I am not asking to fucking cast judgement on my friend! I am not asking to not let my friend raise her own fucking child! I am asking because for for fucking bid I have a question and want to learn before I become a fucking mother! If I had a problem with it, I would have just brought it up with my friend now wouldn't I? I asked here because she is a first time mom and I thought maybe she was confused or possibly doing it wrong and wanted to know. Stop fucking assuming that everyone is out to fucking get mothers.